Tana may refer to: Places Africa Lake Tana, a lake in Ethiopia (and a source of the Nile River) Tana Qirqos, an island in the eastern part of Lake Tana in Ethiopia, near the mouth of the Gumara Ri
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083671435568c72a32f9a57e3e73e2c84eef76c0dfd27e75f162edbd32e63a44. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aadfd258-e02f-4c75-ba90-c9e849b1f129.json and https://artists.proofprofile.net/proofs/artist/aadfd258-e02f-4c75-ba90-c9e849b1f129.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).